The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 09, 2003
Filed:
Dec. 20, 2001
Yasuhiro Kusuyama, Hirakata, JP;
Komatsu Ltd., Tokyo, JP;
Abstract
A hydraulic oil flow controller for a construction machine comprises an operating valve for supplying hydraulic oil discharged from hydraulic pimps and to an attachment, an attachment operating unit for transmitting a pilot signal corresponding to the manipulated variable of the operating valve and a solenoid control valve for changing the flow characteristics of the pilot signal in accordance with a command from a controller An increase and/or decrease signal is sent to the solenoid control valve through the controller from a monitor device so that the flow of the hydraulic oil supplied to the actuator of the attachment is increased and/or decreased. Accordingly, a coefficient of fluctuation of the flow relative to a coefficient of fluctuation of the manipulated variable can be decreased in the work of the attachment of a hydraulic shovel and the operation efficiency upon operation of the attachment can be improved.